CN115655232A - Navigation device and beam shaping element thereof - Google Patents

Navigation device and beam shaping element thereof Download PDF

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Publication number
CN115655232A
CN115655232A CN202211226524.3A CN202211226524A CN115655232A CN 115655232 A CN115655232 A CN 115655232A CN 202211226524 A CN202211226524 A CN 202211226524A CN 115655232 A CN115655232 A CN 115655232A
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CN
China
Prior art keywords
light
shaping
shaping mechanism
light source
light beam
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Pending
Application number
CN202211226524.3A
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Chinese (zh)
Inventor
李世民
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Pixart Imaging Inc
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Pixart Imaging Inc
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Publication of CN115655232A publication Critical patent/CN115655232A/en
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
    • G01C11/00—Photogrammetry or videogrammetry, e.g. stereogrammetry; Photographic surveying
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
    • G01C11/00—Photogrammetry or videogrammetry, e.g. stereogrammetry; Photographic surveying
    • G01C11/02—Picture taking arrangements specially adapted for photogrammetry or photographic surveying, e.g. controlling overlapping of pictures
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B19/00—Condensers, e.g. light collectors or similar non-imaging optics
    • G02B19/0004—Condensers, e.g. light collectors or similar non-imaging optics characterised by the optical means employed
    • G02B19/0009—Condensers, e.g. light collectors or similar non-imaging optics characterised by the optical means employed having refractive surfaces only
    • G02B19/0014—Condensers, e.g. light collectors or similar non-imaging optics characterised by the optical means employed having refractive surfaces only at least one surface having optical power
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B19/00—Condensers, e.g. light collectors or similar non-imaging optics
    • G02B19/0033—Condensers, e.g. light collectors or similar non-imaging optics characterised by the use
    • G02B19/0047—Condensers, e.g. light collectors or similar non-imaging optics characterised by the use for use with a light source
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B19/00—Condensers, e.g. light collectors or similar non-imaging optics
    • G02B19/0033—Condensers, e.g. light collectors or similar non-imaging optics characterised by the use
    • G02B19/009—Condensers, e.g. light collectors or similar non-imaging optics characterised by the use for use with infrared radiation
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/09—Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
    • G02B27/0905—Dividing and/or superposing multiple light beams
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/09—Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
    • G02B27/0916—Adapting the beam shape of a semiconductor light source such as a laser diode or an LED, e.g. for efficiently coupling into optical fibers
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/09—Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
    • G02B27/0916—Adapting the beam shape of a semiconductor light source such as a laser diode or an LED, e.g. for efficiently coupling into optical fibers
    • G02B27/0922—Adapting the beam shape of a semiconductor light source such as a laser diode or an LED, e.g. for efficiently coupling into optical fibers the semiconductor light source comprising an array of light emitters
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/09—Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
    • G02B27/0938—Using specific optical elements
    • G02B27/095—Refractive optical elements
    • G02B27/0955—Lenses
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/0304—Detection arrangements using opto-electronic means
    • G06F3/0317—Detection arrangements using opto-electronic means in co-operation with a patterned surface, e.g. absolute position or relative movement detection for an optical mouse or pen positioned with respect to a coded surface
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/0304—Detection arrangements using opto-electronic means
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/033—Pointing devices displaced or positioned by the user, e.g. mice, trackballs, pens or joysticks; Accessories therefor
    • G06F3/0354—Pointing devices displaced or positioned by the user, e.g. mice, trackballs, pens or joysticks; Accessories therefor with detection of 2D relative movements between the device, or an operating part thereof, and a plane or surface, e.g. 2D mice, trackballs, pens or pucks
    • G06F3/03543—Mice or pucks

Abstract

A navigation device comprises a light beam shaping element, a first light source and a second light source with different characteristics. The beam shaping element is used for shaping the light beams emitted by the first light source and the second light source to illuminate the working surface with approximately the same incident angle and/or approximately the same beam size.

Description

Navigation device and beam shaping element thereof
The application is a divisional application of Chinese invention patent applications with application numbers of 201910047251.8, application dates of 2019, month 01 and 18, and entitled "navigation device and lighting system and beam shaping element thereof".
Technical Field
The present invention relates to a navigation device, and more particularly, to a navigation device having a plurality of light sources with different characteristics, an illumination system thereof, and a beam shaping element for illuminating a work surface with the plurality of light sources at substantially the same incident angle.
Background
An optical navigation device typically has a light source, an image sensor, and a processor. The light source is used for illuminating a work surface. The image sensor is used for detecting the reflected light of the working surface. The processor is configured to calculate movement relative to the work surface based on image features in image frames acquired by the image sensor.
For example, refer to FIG. 1, which is a schematic diagram of a conventional optical navigation device 9. The optical navigation device 9 includes a light guide element 95 for guiding the light emitted from the light source 91 to the working surface S and then guiding the reflected light from the working surface S to the image sensor 93, in addition to the light source 91 and the image sensor 93.
In some cases, optical navigation device 9 may require multiple light sources. At this time, the known light guiding element 95 is not suitable for guiding the light beams emitted by different light sources at the same time, because the plurality of light sources are arranged at different positions and even have different light emitting characteristics, such as different light emitting angles, different wavelengths, and the like.
In view of the above, it is desirable to provide an illumination system capable of simultaneously guiding light beams emitted by different light sources to have substantially the same incident angle so as to maintain the photosensitive efficiency of the image sensor 93 with respect to the different light sources.
Disclosure of Invention
The invention provides a navigation device, an illumination system and a beam shaping element thereof, which can enable light beams emitted by a plurality of light sources with different characteristics to have approximately the same incident angle and/or light beam size relative to a working surface, so as to increase the applicable working surface and increase the application range.
The invention also provides a navigation device which is provided with a shaping mechanism corresponding to each of different light sources, and an illumination system and a light beam shaping element thereof.
The invention provides a navigation device operating on a work surface. The navigation device comprises a first light source, a second light source and a beam shaping element. The first light source has a first emission angle for emitting a first light beam of a first wavelength. The second light source has a second light emission angle for emitting a second light beam at a second wavelength. The beam shaping element is used for shaping the first light beam and the second light beam so that the sizes of the first light beam and the second light beam on the working surface are the same after the first light beam and the second light beam pass through the beam shaping component. The beam shaping component comprises a first shaping mechanism, a second shaping mechanism and a third shaping mechanism. The first shaping mechanism faces the first light source. The second shaping mechanism faces the second light source. The third shaping mechanism faces the working surface, and the third shaping mechanism, the first shaping mechanism and the second shaping mechanism are respectively positioned on two opposite sides of the beam shaping component, wherein the first beam and the second beam are emitted from the third shaping mechanism, and the first beam and the second beam are partially overlapped in an emission area of the third shaping mechanism.
The invention also provides a beam shaping element of the navigation device, which is used for shaping the beam passing through the beam shaping element and comprises a first shaping mechanism, a second shaping mechanism and a third shaping mechanism. The first shaping mechanism is located on a first side of the beam shaping element and is used for receiving the first light beam. The second shaping mechanism is located on the first side of the beam shaping element and is configured to receive a second light beam. The third shaping mechanism is located on a second side of the beam shaping element for outputting the first beam traveling from the first shaping mechanism to the third shaping mechanism at a first exit region and outputting the second beam traveling from the second shaping mechanism to the third shaping mechanism at a second exit region. The first side and the second side are two opposite sides of the beam shaping element, and the first emission area and the second emission area are partially overlapped. And the sizes of the first light beam and the second light beam on the working surface after passing through the third shaping mechanism are the same. The shaping effect of the first shaping mechanism on the first light beam is different from the shaping effect of the second shaping mechanism on the second light beam, and the third shaping mechanism has the same shaping effect on the first light beam and the second light beam.
The invention also provides a navigation device operating on the working surface. The navigation device comprises a first light source, a second light source and a light beam shaping element. The first light source is used for emitting a first light beam with a first wavelength. The second light source is used for emitting a second light beam with a second wavelength. The beam shaping element is provided with a first light incident surface, a second light incident surface and an emergent surface, wherein the first light beam and the second light beam are respectively transmitted to the first light incident surface and the second light incident surface, the sizes of the light beams on the working surface after the first light beam and the second light beam are emitted from the same emergent surface are the same, and the first light incident surface, the second light incident surface and the emergent surface are two opposite surfaces of the beam shaping element.
In the navigation device, the illumination system and the beam shaping element according to the embodiments of the present invention, the different characteristics of the light source include, for example, different wavelengths, different degrees of coherence (degree of coherence), different emission angles, different intensities, and the like. Different beam shaping mechanisms have different shaping effects (shaping effects) on the beam.
The beam shaping element is preferably integrally molded to have the first shaping mechanism, the second shaping mechanism, the third shaping mechanism, and the reflected light shaping mechanism at the same time. Other parts of the beam shaping element, such as the foot part carried by the device shell or the part combined with other elements of the navigation device, can be integrally formed with the shaping mechanism or bonded to the shaping mechanism by adhesive.
In order that the manner in which the above recited and other objects, features and advantages of the present invention are obtained will become more apparent, a more particular description of the invention briefly described below will be rendered by reference to the appended drawings. In the description of the present invention, the same components are denoted by the same reference numerals, and the description thereof is omitted.
Drawings
FIG. 1 is a schematic diagram of a known optical navigation device;
fig. 2 is a schematic diagram of a navigation device, an illumination system thereof and a beam shaping element according to an embodiment of the invention.
Description of the reference numerals
200. Navigation device
20. Substrate board
21. First light source
22. Second light source
23. Image sensor with a light-emitting element
25. Beam shaping element
251. First shaping mechanism
252. Second shaping mechanism
25S third shaping mechanism
253. Reflected light shaping mechanism
29. Shell body
S work surface
Predetermined distance between D1 and D2
Region of interest A
Detailed Description
Fig. 2 is a schematic diagram of a navigation device 200, an illumination system and a beam shaping element thereof according to an embodiment of the invention. The navigation device 200 includes a lighting system, an image sensor 23, and a housing 29, wherein fig. 2 shows only the bottom of the housing 29 and omits other parts to simplify the illustration. The lighting system is disposed inside the housing 29 to be protected by the housing, and is disposed on the bottom of the housing 29.
For example, the navigation device 200 is an electronic device such as an optical mouse, a sweeping robot, etc. operating on the working surface S. In other embodiments, the work surface S is moved relative to the navigation device 200, such as an optical finger navigation mouse. Thus, the work surface S is, for example, a table top, a floor or a finger surface, depending on the application. The navigation device 200 may also include a processor (not shown), such as a Central Processing Unit (CPU), a Microprocessor (MCU) or an Application Specific Integrated Circuit (ASIC), for calculating its motion trajectory relative to the work surface S.
The illumination system comprises a substrate 20, a first light source 21, a second light source 22 and a beam shaping element 25 arranged opposite the substrate 20. Furthermore, the navigation device 200 also includes an image sensor 23, which may be a CCD image sensor or a CMOS image sensor, for outputting image frames at a predetermined frequency. The image sensor 23 is disposed on the substrate 20 and is configured to detect the reflected first light beam and the reflected second light beam reflected by the working surface S and passing through the beam shaping element 25. To simplify the drawing, the reflected first light beam and the reflected second light beam in fig. 2 only show the transmission directions thereof.
The substrate 20 may be a Printed Circuit Board (PCB), a Flexible Circuit Board (FCB), etc. for disposing the first light source 21, the second light source 22, the image sensor 23, a processor and other active and passive components thereon. Generally, the substrate 20 is at a predetermined distance D2 from the working surface S. The predetermined distance D2 is preferably determined before the navigation device is shipped, so as to determine the optical parameters of the beam shaping element 25.
The first light source 21 is disposed on the substrate 20 and has a first emission angle (emission angle) for emitting a first light beam LB1 with a first wavelength. The first light beam LB1 passes through said beam shaping element 25 to illuminate a region of interest (ROI) a on the work surface S. The first light source 21 may be a Light Emitting Diode (LED), a laser diode (such as a VCSEL, but not limited to), or other partially coherent light source.
The second light source 22 is disposed on the substrate 20 and has a second light-emitting angle for emitting a second light beam LB2 with a second wavelength. The second light beam LB2 passes through the beam shaper 25 to illuminate the region of interest a on the work surface S. The second light source 22 may be a light emitting diode, a laser diode (such as, but not limited to, a VCSEL), or other partially coherent light source.
It can be understood that some of the light emitted by the first light source 21 and the second light source 22 is not transmitted toward the first light beam LB1 and the second light beam LB2. In the present invention, the first light beam LB1 and the second light beam LB2 refer to main beams (main beams) emitted by the first light source 21 and the second light source 22.
In a non-limiting embodiment, the first light-emitting angle of the first light source 21 is equal to the second light-emitting angle of the second light source 22, for example, the first light source 21 and the second light source 22 are the same kind of light source (also LED or laser diode) and have substantially the same light-emitting angle. However, the first wavelength (its dominant wavelength) of the first light source 21 is different from the second wavelength (its dominant wavelength) of the second light source 22. In some embodiments, different wavelengths of light may be suitable for illuminating different materials of the work surface to produce different reflection effects. The first wavelength and the second wavelength are, for example, in the range of red light and/or infrared light.
In another non-limiting embodiment, a first light-emitting angle of the first light source 21 is different from a second light-emitting angle of the second light source 22, for example, the first light source 21 and the second light source 22 are different kinds of light sources. Meanwhile, the dominant wavelength of the first light source 21 is different from that of the second light source 22.
In another non-limiting embodiment, the first emission angle of the first light source 21 is different from the second emission angle of the second light source 22, and the dominant wavelength of the first light source 21 is equal to the dominant wavelength of the second light source 22. In some embodiments, the different light emitting angles indicate that the first light source 21 and the second light source 22 have different light intensities or coherence degrees, so as to be suitable for illuminating working surfaces of different materials to generate different reflection effects.
The beam shaper 25 is configured to shape the first light beam LB1 and the second light beam LB2 such that at least one of an incident angle and a beam size of the first light beam LB1 and the second light beam LB2 with respect to the working surface S is substantially the same after passing through the beam shaper 25. Alternatively, the first beam LB1 and the second beam LB2 may have substantially the same beam size and/or transmission angle after exiting the beam shaper 25. In the present invention, the shaping refers to changing the size and/or the traveling direction of the light beam.
In one non-limiting embodiment, the beam shaping element 25 comprises a first shaping mechanism 251, a second shaping mechanism 252, a third shaping mechanism 25S, and a reflected light shaping mechanism 253.
The first shaping mechanism 251 is located on a first side (e.g., the upper side in fig. 2) of the beam shaping element 25 and has a first light incident surface facing the first light source 21 for receiving the first light beam LB1 emitted by the first light source 21. The first beam LB1 passes through the first shaping mechanism 251 and the beam shaping element 25, and then exits the beam shaping element 25 from the exit surface of the third shaping mechanism 25S. In fig. 2, the first shaping mechanism 251 is shown as a protruding surface opposite to the first side surface of the beam shaping element 25 to have the function of collecting the light beam, but the invention is not limited thereto. The first shaping mechanism 251 may be a plane or a concave surface with respect to the different first light sources 21.
The second shaping mechanism 252 is located on the first side of the beam shaping element 25 and has a second light incident surface facing the second light source 22 for receiving the second light beam LB2 emitted by the second light source 22. The second beam LB2 passes through the second shaping mechanism 252 and the beam shaping element 25, and then exits the beam shaping element 25 from the exit surface of the third shaping mechanism 25S. In fig. 2, the second shaping mechanism 252 is shown as a concave surface relative to the first side surface of the beam shaping element 25 to have the effect of amplifying the light beam, but the invention is not limited thereto. The second shaping mechanism 252 may be planar or convex with respect to a different second light source 22.
In this embodiment, the first light beam LB1 and the second light beam LB2 are transmitted to the first light incident surface and the second light incident surface, respectively, and the first light beam LB1 and the second light beam LB2 in the beam shaper 25 exit the beam shaper 25 from the exit surface to the working surface S.
A third shaping mechanism 25S is located on a second side (e.g., the lower side of fig. 2) of the beam shaping element 25 facing the working surface S for outputting the first beam LB1 and the second beam LB2. The area of the third shaping means 25S is preferably larger than the first beam LB1 and the second beam LB2. In fig. 2, the third shaping mechanism 25S is shown as a protruding surface opposite to the second side surface of the beam shaping element 25 to have the function of focusing the light beam, but the invention is not limited thereto. The third shaping mechanism 25S may be a plane or a concave surface with respect to the first shaping mechanism 251 and the second shaping mechanism 252.
In the present invention, since the first light source 21 and the second light source 22 are located at different positions and have different characteristics (e.g., different emission angles, dominant wavelengths, coherence degrees, etc.), the shaping effect of the first shaping mechanism 251 on the first light beam LB1 is different from the shaping effect of the second shaping mechanism 252 on the second light beam LB2, so that the shaped light beams have similar beam sizes and/or transmission directions. For example, one of the first shaping mechanism 251 and the second shaping mechanism 252 is used to expand the beam and the other is used to condense the beam.
In addition, in order to make both the first beam LB1 and the second beam LB2 reach the third shaping mechanism 25S, at least one of the following configurations can be selected: (1) The first shaping mechanism 251 and the second shaping mechanism 252 have different heights on the first side of the beam shaping element 25 so as to have different distances from the corresponding first light source 21 and second light source 22; (2) The first shaping mechanism 251 and the second shaping mechanism 252 have different tilt angles on the first side of the beam shaping element 25, wherein the tilt angles are determined according to the relative positions of the shaping mechanisms, the thickness of the beam shaping element 25 and the characteristics of the light source under the condition that the distances D1 and D2 are fixed.
Since the first beam LB1 and the second beam LB2 both exit the beam shaper 25S from the third shaping mechanism 25S, the third shaping mechanism 25S has substantially the same shaping effect on the first beam LB1 and the second beam LB2. That is, the beam shaping element 25 of the present invention adjusts the beams with different characteristics to have substantially the same size and/or transmission direction by the first shaping mechanism 251 and the second shaping mechanism 252, and the third shaping mechanism 25S is used to guide the outgoing beam to the region of interest a. The desired size of this region of interest a will influence the configuration of the third shaping mechanism 25S.
The reflected light shaping mechanism 253 is, for example, a lenticular lens, and shapes the reflected first beam and the reflected second beam so as to be effectively detected by the image sensor 23. In one non-limiting embodiment, the reflected first beam and the reflected second beam preferably pass through the center of the reflected light shaping mechanism 253, whereby even if the reflected first beam and the reflected second beam have different wavelengths of light, no refraction occurs in the reflected light shaping mechanism 253. That is, as long as the first beam LB1 and the second beam LB2 have substantially the same incident angle with respect to the working surface S, the reflected light can enter the image sensor 23 in substantially the same transmission direction. In addition, the reflected light shaping mechanism 253 can also be selected to be a biconcave lens or other forms, which are determined according to the size of the region of interest a.
Referring to fig. 2 again, in a non-limiting embodiment, the first light source 21 is a light emitting diode for emitting a first light beam LB1 with a first wavelength; and the second light source 22 is a laser diode for emitting a second light beam LB2 at a second wavelength. The first shaping mechanism 231 faces the light emitting diode. The second shaping mechanism 232 faces the laser diode. Since the led generally has a larger light emitting angle than the laser diode, the first shaping mechanism 231 collects the first light beam LB1, and the second shaping mechanism 232 expands the second light beam LB2 so that the beam sizes of the shaped first light beam and the shaped second light beam are close to each other.
In fig. 2, the first shaping mechanism 251 is shown as being farther from the led and the second shaping mechanism 232 is shown as being closer to the laser diode, but this is for illustration only and not for limiting the invention. If the first shaping mechanism 251 is closer to the led and the second shaping mechanism 232 is farther from the laser diode, the curvature, cross-sectional area, and tilt angle of the first shaping mechanism 251 and the second shaping mechanism 252 are synchronously changed, so that the first beam LB1 and the second beam LB2 are transmitted to the third shaping mechanism 25S.
It should be noted that, although fig. 2 shows that the first light source 21 and the second light source 22 are disposed on the substrate 20 relative to the image sensor 23 in a first direction (e.g., the left-right direction of fig. 2), and the first light source 21 is closer to the image sensor 23 and the second light source 22 is farther from the image sensor 23, this is only for illustration and not for limiting the invention.
In other non-limiting embodiments, the first light source 21 may be configured to be farther from the image sensor 23 and the second light source 22 may be closer to the image sensor 23. Alternatively, the first light source 21 and the second light source 22 are substantially equidistant from the image sensor 23. In this embodiment, the position and the tilt direction of the shaping mechanism of the beam shaping device 25 corresponding to the first light source 21 and the second light source 22 are also adjusted synchronously.
The beam shaping element 25 is disposed on the housing 29, for example, fig. 2 shows that the beam shaping element 25 has a foot supported on the bottom of the housing 29. In manufacturing the beam shaper 25, the distance D2 between the substrate 20 and the working surface S and the thickness (e.g., the distance D1) of the housing 29 are preferably fixed, so that the optical characteristics of the first shaper 251, the second shaper 252, the third shaper 25S and the reflected light shaper 253, such as the beam scaling (e.g., curvature), the refraction angle, the tilt angle, the distance from the light source, the distance from the working surface S, the distance from the image sensor 23, etc., can be determined according to the position of the region of interest a at the bottom opening of the housing 29.
It should be noted that although fig. 2 shows the first light source 21 and the second light source 22 located in the same space (e.g. surrounded by the opaque element), the invention is not limited thereto. In other non-limiting embodiments, the first light source 21 and the second light source 22 are respectively located in different spaces, for example, a light blocking member is provided between the first light source 21 and the second light source 22 to prevent emitted lights from interfering with each other.
It should be noted that although fig. 2 shows that the first beam LB1 and the second beam LB2 are not reflected in the beam shaper 25 and directly exit the beam shaper 25 from the region of the third shaping mechanism 25S, the present invention is not limited thereto. In one non-limiting embodiment, at least one of the first beam LB1 and the second beam LB2 is reflected at least once in the beam shaper 25 before exiting the beam shaper 25 from the area of the third shaping mechanism 25S such that the first beam LB1 and the second beam LB2 have substantially the same beam size and/or transmission angle after exiting the beam shaper 25.
It should be noted that, although fig. 2 shows that the beam shaping element 25 is a transparent (transparent with respect to the first light source 21 and the second light source 22) glass or plastic product formed integrally, the present invention is not limited thereto. In one non-limiting embodiment, the beam shaping element 25 comprises more than one (e.g., one for each light source) separate transparent shaping elements such that the first light beam LB1 and the second light beam LB2 incident on the work surface S have substantially the same incident angle and/or beam size.
The navigation device 200 further includes a light shielding portion (for example, a hatched portion) surrounding the first light source 21, the second light source 22, and the image sensor 23 to prevent stray light from interfering with each other.
In other embodiments, the navigation device 200 includes more than two light sources, and the beam shaper 25 includes a plurality of shaping mechanisms respectively corresponding to the light sources, so that the light beams emitted from the light sources illuminate the region of interest a of the work surface S at substantially the same incident angle and/or beam size.
The way of controlling the image sensor 23 to emit light (synchronously or time-divisionally) with respect to the first light source 21 and the second light source 22 to obtain image frames is well known, and thus is not described herein again.
In summary, the conventional optical navigation device has a single illumination channel (as shown in fig. 1) and is limited in use. Therefore, the present invention further provides a navigation device, an illumination system thereof and a beam shaping element (fig. 2), which has a plurality of illumination channels and corresponding beam shaping mechanisms. After passing through the beam shaping mechanism, the light beams of the illumination channels are adjusted to have approximately the same divergence angle and incidence angle, so as to increase the applicable environment.
Although the present invention has been disclosed by way of examples, it is not intended to be limited thereto, and various changes and modifications can be made by one of ordinary skill in the art without departing from the spirit and scope of the invention. Therefore, the protection scope of the present invention should be determined by the scope of the appended claims.

Claims (10)

1. A navigation device for operation on a work surface, comprising:
a first light source having a first emission angle for emitting a first light beam at a first wavelength;
a second light source having a second light emission angle for emitting a second light beam at a second wavelength; and
a beam shaping element for shaping the first and second beams so that the first and second beams have the same beam size on the working surface after passing through the beam shaping element, wherein the beam shaping element comprises:
a first shaping mechanism facing the first light source;
a second shaping mechanism facing the second light source; and
a third shaping mechanism facing the working surface, wherein the third shaping mechanism, the first shaping mechanism and the second shaping mechanism are respectively positioned on two opposite surfaces of the beam shaping element,
wherein the first light beam and the second light beam are emitted from the third shaping mechanism, and the first light beam and the second light beam are partially overlapped in an emission area of the third shaping mechanism.
2. The navigation device of claim 1,
the first light emission angle is equal to the second light emission angle, and
the first wavelength is different from the second wavelength.
3. The navigation device of claim 1,
the first light emission angle is different from the second light emission angle, and
the first wavelength is different from the second wavelength.
4. The navigation device of claim 1,
the first light emission angle is different from the second light emission angle, and
the first wavelength is equal to the second wavelength.
5. The navigation device of claim 1, further comprising:
a substrate; and
an image sensor disposed on the substrate and configured to detect a reflected first light beam and a reflected second light beam reflected by the working surface and passing through the beam shaping element,
the first light source and the second light source are disposed on the substrate along a first direction relative to the image sensor and have different distances from the image sensor.
6. The navigation device of claim 5,
the first shaping mechanism has a shaping effect on the first light beam different from a shaping effect on the second light beam by the second shaping mechanism, and the third shaping mechanism has the same shaping effect on the first light beam and the second light beam.
7. The navigation device of claim 6, wherein a distance of the first shaping mechanism from the first light source is different than a distance of the second shaping mechanism from the second light source.
8. A navigation device according to claim 1, wherein one of the first and second shaping mechanisms is for expanding a beam and the other is for condensing a beam.
9. A beam shaping element of a navigation device, the beam shaping element for shaping a light beam passing therethrough, comprising:
the first shaping mechanism is positioned on the first side of the beam shaping element and used for receiving the first light beam;
a second shaping mechanism located on the first side of the beam shaping element for receiving a second beam; and
a third shaping mechanism located on a second side of the beam shaping element for outputting the first light beam traveling from the first shaping mechanism to the third shaping mechanism at a first exit region and outputting the second light beam traveling from the second shaping mechanism to the third shaping mechanism at a second exit region, wherein,
the first side and the second side are two opposite sides of the beam shaping element, and the first emission area and the second emission area are partially overlapped,
the first beam and the second beam have the same beam size on the working surface after passing through the third shaping mechanism, an
The shaping effect of the first shaping mechanism on the first light beam is different from the shaping effect of the second shaping mechanism on the second light beam, and the third shaping mechanism has the same shaping effect on the first light beam and the second light beam.
10. A navigation device for operation on a work surface, the navigation device comprising:
a first light source for emitting a first light beam at a first emission angle;
a second light source for emitting a second light beam at a second light emission angle; and
the light beam shaping element is provided with a first light incident surface, a second light incident surface and an emergent surface, wherein the first light beam and the second light beam are respectively transmitted to the first light incident surface and the second light incident surface, the sizes of the light beams on the working surface after the first light beam and the second light beam are emitted from the same emergent surface are the same, and the first light incident surface, the second light incident surface and the emergent surface are two opposite surfaces of the light beam shaping element.
CN202211226524.3A 2018-07-26 2019-01-18 Navigation device and beam shaping element thereof Pending CN115655232A (en)

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